Underfeed-furnace.



PATENTED APR. 17, 1906.

W. R. WOOD. UNDERFEED FURNACE.

APPLICATION FILED MAB.25.1904.

4 SHEETS-SHEET 1.

"UTA 5555 v mew No. 818,010. PATENTED APR. 17,1906. W. R. WOOD.

UNDERFEED FURNACE.

APPLICATION FILED MAR.25,1904

' 4 SHEETSSHEET 2.

PATENTED APR. 17, 1906.

' W. R. WOOD. UNDERFEED FURNACE.

APPLICATION FILED MAR.25,1904.

4 SHEETS-SHEET 3.

[VITA/5558.

PATENTED APR. 17, 1906.

4 SHEETS-SHEET 4.

Fig.5

WITNESSES.

H No. 818,010.

1; UNITED STAWENT mm, WILFRED ROTHERY woon, or LoNDoN, ENGLAND.

I UNDERFEED-FURNACE.

Patented April 17, 1906.

To all whom it may concern.-

Be it'known that I, WILFRED ROTHERY WOOD, a citizen of the United States of America, residingat London, England, have invented a certain new and useful Improvement in Underfeed-Furnaces, of which the following is a specification.

It is common at the present time to feed fuel to furnaces 'by'means of ascrew c011- I indicated, and the nature of the same will be bars on one side of the furnace only;

understood from the following description, reference-bemg made to the accompanying drawings, in which- Figure 1 is a longitudinal sectional eleva tion on the line 1 1 of Fig. 2, the motor-cylinder, cross-head, u standing rib, and 111g hereinafter mentioned bein shown, however, in elevation Fig. 2, a p an view with atea sectional elevation on the line m m, Fig. 2;

Fig. 4, a side elevation with some of the parts omitted; Fig. 5, a detail cross-section on w w of Fig. 4; Flg. 6, a sectional elevation on the line 2 2 of Fig.2, but showing grate-bars on both sides; and Fi 7 is an enlarged sectional 'plate by means of a epending yoke 10, en-

/ view of the gratea'rs themselves and of the bedlate rocking bar.

Beneatl gthe usual feed-ho per 1 is a fixed u on which wor the pusher 3,

I the ength an shape of which is so proportioned as to practically'close the bottom of the ho per when in its innermost o'sition. Beneath the finedplate 2 is a movable plate 4, which at its inner end forms the bottom of the fuel-magazine 5 and carries the fuel into same, said platefbeing also provided with ushingfaces '16, rising, mound-like, thereom, the inner faces being at approximate A right angles to said plate and the to round.-

off downwardly th ereto,. while t e outer faces .from the crown form gentle declines, with the object of securing a 00d ,and even forward feed of fuel in contra istinction to a simple banking-up process in the front of the furnace and also to slightly raise and ag'tate late moves backwar and 19,,and thence up through the tipping 'side grates 20 and also between the bars 14, which are of box-like form.

The movable plate is provided at its outer end with an upstanding rib 6, adapted to fill a corresponding slot in the fixed'plate 2, and from such rib or movable plateprojects a lug 7, engaging with the pusher. In Fig. 1 the upstanding rib 6 is shownas being nearly at the back of slot in the late 2, and this is its position when the pus er is at the outer end of its'stroke. The engagement is preferably by means of the lug bearing against a face 8 of the pusher for'motion in one direction and of adiustingscrew 9, which-passes through the bearing u on the wal of the opposite en of the pusher. By this means the usher may be made to have, the same longitudinal motion as the movable plate or a certain amount of lost motion, as may be desired. In. eitherevent revents the feed-plate 4 k the fixed plate 2 carr ing back the el delivered to it. otionmay be im arted to the movable gaging with the piston-rod 11 of a motor- 0 in e r 1 10 .and the reciprocating motionso o tained is converted into reciprocat' that of the movable plate 4 by supplying such gllate with grooved guide pieces or nuts 12, w 'ch through spiral feathers or projections 22 impart a-rockingmotion. to bars 13, which in turn operate the ate-bars 14. The grooves in, 12 are preferab y out spirally or curved, andthe feathers 22am similarly mo tion for the grate-bars 14 at right ang es to formed, so as to be adapted to engage there'- with, so as to impart a roc motion to the bars 21 and throu h them to t e rocking bars proper, 13, whic beneath the, grates are either-pivoted; at their base or preferably made of double-bulb section, the lowerbulb resting in a suitable reces'sdn the casing, while the'upper one engages with notches 15 in the grate-bars to be rocked or moved, as most clearly seen in Figs. 6 and 7.

The feathers 22, operated by the nuts 12, I

may be formed directly on rocking bars 13; but it is more convenient to have separate shafts and couple them with the bars by another-bar 21, Fig. 5, adapted to drop into "recesses in the bars and shafts, as this construction enables the movement of the gratebars on one side of the furnace to be' readily stoppedwhile those on the other side con- 'tinue to operate.

If, desired, certain of the grate-bars as, fof insts glce, alternate ones may be fixed.

By reference to the drawings, particularly Fig. 6, it be seen-that by properly proportionin and positioning the rocking bars 13;..and t ef'grate -bars, with which they en age, With frelation to each other it is possib} e to imlpartf'a sim le reciprocating movement to t e gratears, or they may also be given a rising-and-falling movement. Thus the de th of the notch 15 1n a grate-bar may be made such that the bar 13 will bear only against its sides. The grate-bar will then have simple reciprocating motion. If, however, the depth of the notch is such that it is engaged by the top of the bar 13, the gratebar will, in addition to its reciprocating motion, be caused to rise and fall as the bar 13 is rocked backand forth.

With the construction indicated it will be noted that when it is desired to move more or p less of the fuel to the back of the retort-chamber this can be secured by adjusting the,

smokeless com ustion.

whole ength' of such grate-bars down into the ash-(pitflrom whence it rises between the The object in makingthe grate-bars of boxlike cross-section, with end openings only and without direct o enings on the furnace side, is

to insure that a l the blast shall first pass to the ointwhere the heat is greatest-namely, at the retort end-and that such portion as is not re uired for the retort shall pass the bars an to theside grates when they are employed. This construction not only insures the cooling of the bars Where most likely to burn out, but also increases the heat of the blast which passes to the coked fuel from the ash-pit.

I am aware thatit has heretofore been proposed to employ a feed-plate' forming more or less of the furnace-bottom, and I do not in the present ap lication claim such construction, for-other 'own methods of feedin the fuel to the retort'may be employed. am also aware that it has been proposed to recipr ocate grate-bars both longitudinally of tort, said grate-bars being adapted to take all the air to sup ort combustion at their retort ends and to eliver a portion to such retort and all the remainder to the ash pit, and an inclosed ash-pit adapted to receive said air, substantially as described.

2. In underfeed-furnacesand in combination, a retort, means for feeding the fuel thereto, grate-bars of box-like cross-section each havlng one end in proximity to the retort, said grate-bars being adapted to take all the air to sup ort combustion at their retort ends and to eliver a portion to such retort and all the remainder to the ash-pit, an inclosed ash-pit adapted to receive said air, and means for reciprocating the grate-bars substantiall as described.

3. In un erfeed-furnaces and in combination, a retort, means for feeding the fuel thereto, grate-bars of box-like cross-section each having one end in proximity to theretort, said grate-bars being adapted to take all the air to sup ort combustion at their retort ends and to eliver'a portion to such retort and all the remainder to the ash-pit, an inclosed ash-pit adapted to receive such" air, and tipping grates at the outer ends of said grate-bars, substantially as described.

4. In underfeed-furnaces and in combination, a retort, means for feeding the fuel thereto, grate-bars of box-like cross-section each having one end in proximity to the retort, said grate-bars being adapted to take all the air to sup ort combustion at their retort ends and to eliver a portion-to such retort vand all the remainder to the ash-pit, an inclosed ash-pit adapted to receive said air,

means for reciprocating the grate-bars and tipping grates at the outer ends of said gratebar's, substantially as described.

Ioo'

5. In underfeed-furnaces and in combina tion, a retort, means for feeding the fuel thereto grate-bars of box-like cross-section each havmg one end in proximity to the reizo tort, said grate-bars being adapted to take all the air to sup ort combustion at'their retort ends and to eliver a portion to'such retort and all the remainder to the ash-pit, an inclosed ash-pit adapted to receive said air.

rocking bars adapted to reciprocate said grate-bars and means for rocking said rocklng bars, substantially as described.

10 rocking 'bars, notches on the grate-bars with eliver a portion to such retort which said rocking bars engage, and means for operating the rocking bars, substantially as described. y

In testimony whereof I have hereunto set my hand in the presence of two subscribing 15 Witnesses.

- WILFRED ROTHERY WOOD.

Witnesses:

PHILIP M. JUSTICE, EDWARD TRUMP FOSTER. 

